Bobbi Kristina’s an unfriendly neighbor?

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Bobbi Kristina allegedly got into a vicious war of words with an ex-neighbor, and now he's suing.

According to TMZ, the man had repeatedly made noise complaints against her and her boyfriend Nick Gordon, resulting in their moving out. "[You are] s**t at the bottom of our shoe," she wrote in a note that she pinned on the door of the man and wife. “You were honored to have us living above you and you couldn't stand such a young beautiful couple far more successful than you will ever be,” she continued.

Though the man has filed a police report, according to TMZ, the cops say that there is no criminal act involved in leaving an angry letter that contains no threats.